JPH09169171A - Retransfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fixture of a sheet during retransfer and render it immovable by setting a coefficient of static friction of a surface finishing agent being formed on the surface of an ink image transfer side to be more than a specific value or more. SOLUTION: A retransfer sheet 10 forms a surface finishing layer 12 on one surface of a base material 11 as a base sheet. The surface finishing agent layer 12 formed on one surface of the base material 11 is desirable to be 0.25 or more, preferably, to be 0.3 or more in its coefficient of a surface static friction. This is needed for fixing the sheet not to dislocate from its position and enabling a complete retransfer image to be formed during the period of retransferring an ink image 13 from the surface of the sheet onto the matter to be transferred. Thus, the fixture of the retransfer sheet relative to the acceptor becomes easy at the retransfer period, so that the retransfer sheet is rendered immovable, and the formation of the retransfer image becomes possible completely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry transfer agent retransfer sheet for forming characters, symbols, figures, etc. on the surface of an object to be transferred by pressure-sensitively transferring images of characters, symbols, figures, etc. In particular, the present invention relates to a retransfer sheet in a dry transfer material which is produced by printing and heat transfer by a printing device such as a heat transfer type printer, a typewriter and a word processor.

[0002]

2. Description of the Related Art In the past, instant lettering has been carried out by using a dry transfer material or sheet, and a transferred image or indicia such as characters and figures attached thereon.
By peeling and transferring a) to any receiving surface,
Is being done. As a basic sheet for forming a transfer image of this transfer material, a transparent or semitransparent plastic film alone or a film having a peelable coating on the film is used. ,
An image is formed on a basic sheet by printing such as screen printing, and an adhesive layer of a pressure-sensitive adhesive is provided on the image, and the adhesive force of the pressure-sensitive adhesive transfers the image from the basic sheet to an object to be transferred. is there.

A report on a basic sheet capable of producing a dry transfer material by a thermal transfer system is disclosed in Japanese Patent Application No. 61-
It is made by the specification and drawings attached to the 275537 application.

In this report, a film made of polyethylene, polypropylene, fluororesin or the like having a smooth surface texture having a contact angle with water of at least 95 °,
A sheet in which a coating layer made of a silicone resin is formed on the surface of paper, metal foil, or a plastic film substrate is used.

[0005]

However, in order to form an image by thermal transfer on a sheet having such a contact angle of 95 ° or more (particularly 105 ° or more), the surface tension of the ink should be reduced to obtain the sheet. Since the adhesive force between the sheet and the ink must be made greater than the cohesive force between the inks and the adhesive force between the inks and the polyethylene terephthalate (PET) substrate, the temperature of the ink needs to be raised. . However, in order to achieve this, high printing energy is required, which is extremely disadvantageous to the thermal transfer device, such as durability of the head and load on the power source.

Further, an image formed on a surface having poor wettability by thermal transfer is re-transferred by applying a little pressure because the adhesion to the surface is weak. Therefore, even an unnecessary image is retransferred, which causes stain. Moreover, there is a problem in that the image can be taken out by just touching it a little during handling.

Further, since the coefficient of static friction on the surface of the sheet is extremely small, there is a problem that the sheet is apt to move and is difficult to fix when re-transferring the heat-sensitive transferred ink image. Therefore, the retransfer image is displaced or distorted, and a perfect image cannot be obtained.

By the way, in order to prevent the movement of the sheet, which is a problem at the time of pressure-sensitive retransfer, the Japanese Patent Application No. 62-80 is used.
In the specification and drawings attached to the application No. 127, it is reported that the adhesive layer is provided on the sheet separately from the transfer pattern.

However, partially providing this adhesive layer at a predetermined position requires a great deal of manufacturing work and requires a dedicated device, which is very costly. Further, in order to cover the surface of the adhesive material until the time of use, release paper or the like must be attached, and further devising of the device and cost are required. In addition, it is necessary to apply two types of coating layer and adhesive layer on a sheet provided with a peelable coating layer made of a silicone resin, and whichever is applied first is applied later. There is a good chance that it will affect you. That is, if silicone is applied first, cissing will occur when the adhesive is applied, whereas if adhesive is applied first, it becomes difficult to apply due to stickiness.
Even if a release paper is attached to prevent the stickiness, the thickness of the release paper makes the coating difficult. Even if it can be successfully manufactured, since the adhesive layer is present only in a part, the whole area around the image is not fixed, so the sheet still moves and it is difficult to form a perfect image. is there.

The present invention has been made in view of such circumstances, and the first object thereof is to:
An object of the present invention is to provide a retransfer sheet in which the sheet is easily fixed at the time of retransfer and the movement is slow.

A second object of the present invention is to provide a retransfer sheet in which the ink image on the retransfer sheet does not separate due to slight pressure or abrasion.

A third object of the present invention is to provide a retransfer sheet which can obtain good transfer quality with low transfer energy.

Still further, a fourth object of the present invention is to provide a retransfer capable of obtaining a good retransfer quality even though the adhesive force between the ink image and the retransfer sheet is increased as compared with the conventional one. To provide a seat.

[0014]

In order to achieve the above object, the present invention is characterized in that the surface treating agent of the retransfer sheet has a static friction coefficient of 0.25 or more.

Here, the contact angle of the surface treatment agent with water is preferably 80 to 120 °. Further, it is desirable that the composition of the surface treatment agent contains an ethylene-vinyl acetate copolymer, and further, it is desirable that the composition of the surface treatment agent contains polyethylene. Further, the surface treatment agent may have an elongation of 100% or more.

The present retransfer sheet as described above is prepared on a retransfer sheet to be printed according to the present invention when a dry transfer agent is prepared by using a printing device such as a thermal transfer type printer, typewriter or word processor. A surface treatment agent having a static friction coefficient of 0.25 or more is used. This facilitates fixing of the retransfer sheet to the receptor during retransfer.

[0017]

DETAILED DESCRIPTION OF THE INVENTION Retransfer sheet 10 according to the present invention.
For example, as shown in FIG. 1, the surface treatment agent layer 12 is formed on one surface of the base material 11 as the base material sheet.

The substrate 11 has a thickness of 25 to 200 μm,
Preferably, it has a thickness of 50 to 150 μm. And, in manufacturing, while having sufficient mechanical strength in handling, so that pressure is easily applied during pressure-sensitive retransfer, and in order to easily manufacture a dry transfer material by thermal transfer,
It is desirable to have some flexibility.

However, if the elongation is too large, the base material is elongated by applying pressure at the time of retransfer and the image is distorted. Therefore, a film having an elongation of 200% or less is preferable.

Further, the substrate is preferably transparent or translucent so that the image can be accurately retransferred onto an object to be transferred as an image receiver at the time of pressure-sensitive retransfer. It is desirable that the sheet is a semi-transparent sheet so that it is easy to confirm whether or not it has been retransferred to.

As the substrate having such characteristics, plastic film, paper, metal foil, etc. are generally used. Examples of the plastic film, ethylene, polypropylene, a fluorine-based film made of a fluororesin of ethylene-tetrafluoroethylene copolymer or tetrafluoroethylene-hexafluoroethylene copolymer, polyethylene terephthalate, nylon, polyimide, polyvinyl chloride, Examples thereof include polycarbonate, polysulfone, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and ionomer.

Next, the surface treatment material layer 12 formed on one surface of the base material 11 has a surface static friction coefficient of 0.25 or more, preferably 0.3 or more.

This is necessary in order to form a complete retransfer image by fixing the ink image 13 so that the sheet does not move and become misaligned when retransferring the ink image 13 from the sheet to the transferred material. Become.

Further, by setting the contact angle with water to 80 to 120 °, preferably 80 to 110 °, the ink image 1
Since the adhesive force between No. 3 and the retransfer sheet can be increased, retransfer to an unnecessary portion is prevented even with a slight pressing pressure. Further, since it is difficult to peel off even if it is rubbed, it becomes easy to handle.

Further, in the past, when a large image was transferred by a thermal transfer device, when the head was a small serial,
It was necessary to form the image multiple times, and it was necessary to transfer the images in layers. Therefore, the head scratches off the previously transferred image at the time of the next transfer, and there is a problem that a perfect image cannot be formed. Therefore, by dividing the image line by line and transferring it separately, the scratching of the image by the head was prevented, and when re-transferring, the re-transferred image was completed by combining the divided images one after another. When the sheet of the present invention is used, since the adhesive force is increased, it becomes possible to perform thermal transfer in a state where large images are connected.

Since the wettability is improved and the adhesive force is increased, it is possible to form a heat-sensitive transfer image with low heat transfer energy, and a good quality can be obtained.

Furthermore, it is desirable that the surface treating agent has an elongation of 100% or more. As a result, when pressure is applied during retransfer, the surface treatment agent expands unilaterally, and the adhesion between the surface treatment agent and the image is weakened. Therefore, even if the surface treatment agent has a good wettability and a large adhesive force, the retransfer property becomes good.

Examples of the above-mentioned materials used as the surface treatment agent include polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer, ethylene-methacrylic acid copolymer. , Silicone, and the like.

By providing such a surface treating agent on the above-mentioned sheet, good re-transfer properties such as heat-sensitive transfer property, re-transfer property, scratch resistance, image adhesion during handling, fixing of the sheet during re-transfer, etc. can be obtained. A transfer sheet can be obtained.

The ink ribbon used for heat-transferring a desired transfer image onto such a re-transfer sheet is a wax that is used in a printing device such as an ordinary heat-transfer type printer, typewriter, and word processor. There is no problem even if the main ink is applied, but it is necessary to use a double-layered ink ribbon consisting of a transferability adjusting layer and an ink layer with further improved thermal transferability and pressure-sensitive retransferability. Is desirable. This transferability adjusting layer is
It is a layer provided on the ink layer as a top coat layer, and has a higher heat-sensitive adhesiveness, hardness, viscosity and cohesive force than the ink layer, so that the feeling on the retransfer sheet having poor wettability can be obtained. The thermal transfer property is remarkably improved,
In addition, it is possible to integrally perform pressure-sensitive retransfer.
Moreover, by giving the ink layer pressure-sensitive adhesiveness, the pressure-sensitive retransfer property is further improved.

Hereinafter, some examples showing the present invention more specifically will be shown, and the present examples will be made more concrete, but the present invention will be limited by such description. Needless to say, they are not subject to

The present invention is not limited to the following embodiments, and in addition to the above specific description, various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that modifications, improvements, etc. may be added.

Example 1 A surface-treating agent having the following composition was applied onto a polyethylene terephthalate film having a thickness of 50 μm, the contact angle with water was 85 to 90 °, and the coefficient of static friction was about 0.45.
A retransfer sheet having a smooth surface was obtained. The elongation of this surface treatment agent is 600%.

Surface-treating agent composition parts by weight ethylene-vinyl acetate copolymer 10 [EVAFLEX 420 manufactured by Mitsui DuPont Polychemical Co., Ltd.] Toluene 90 On the retransfer sheet thus obtained, an ink was formed by a thermal transfer type word processor. Was thermally transferred to obtain a dry transfer material having a desired transfer image. At that time, the energy can be reduced as compared with the conventional case, and a good transferred image can be obtained. Then, when the pressure-sensitive retransfer to the transfer target such as paper or plastic was performed using the obtained dry transfer material, a clean retransfer image could be obtained. In addition, since the sheet does not move much and can be fixedly retransferred, there is an advantage that a good retransfer image can be easily obtained.

By the way, the thickness of this surface treatment agent is set to 1 μm.
m, 3 μm, 5 μm, 5 μm, 3 μm,
The retransfer property was good in the order of 1 μm. It is considered that this is because the larger the thickness, the larger the absolute amount of elongation.

Example 2 A nylon film having a thickness of 100 μm was used, and a surface treatment agent having the following composition was applied onto the nylon film so that the contact angle with water was 8:
A retransfer sheet having a smooth surface having a static friction coefficient of about 0.45 at 5 to 90 ° was obtained. The elongation of this surface treatment agent is 600%.

Surface-treating agent composition parts by weight ethylene-vinyl acetate copolymer 100 [Chemipearl V-200 manufactured by Mitsui Petrochemical Industry Co., Ltd.] And, using the retransfer sheet thus obtained, Example 1 Similarly, when a dry transfer material was manufactured and a retransfer image was formed on the transfer target by pressure-sensitive retransfer, a clean retransfer image could be obtained.

Example 3 A polypropylene film having a thickness of 50 μm was coated with a surface treatment agent having the following composition, and the contact angle with water was 87 to 90 °, and the coefficient of static friction was 0.32. A retransfer sheet having a degree was obtained. The elongation of this surface treatment agent is 650%.

Surface-treating agent composition parts by weight ethylene-vinyl acetate copolymer 10 [EVAFLEX640 manufactured by Mitsui DuPont Polychemical Co., Ltd.] Toluene 90 And the retransfer sheet thus obtained was used as in Example 1. Similarly, when a dry transfer agent was produced and a retransfer image was formed on the transfer target by pressure-sensitive retransfer, a clean retransfer image could be obtained.

Comparative Example 1 A dry transfer material was prepared in the same manner as in Example 3 using a high density polyethylene film having a thickness of 100 μm. However, since the elongation of this film is as large as 500%, if the film is locally pressed at the time of retransfer, the film will be expanded and the retransfer image will be distorted. Therefore,
It is difficult to obtain a clean retransfer image.

Comparative Example 2 A polyethylene terephthalate film having a thickness of 50 μm was coated with a surface treating agent having the following composition, the contact angle with water was 110 to 120 °, and the coefficient of static friction was about 0.21. A retransfer sheet having a smooth surface was obtained. The elongation of this surface treatment agent is 0%.

Surface treatment agent composition by weight Silicone 10 [Shin-Etsu Chemical Co., Ltd. KS-841] Curing agent 0.3 [Shin-Etsu Chemical Co., Ltd. PL-8] Toluene 90 Re-obtained in this way Since the transfer sheet has poor wettability, high energy is required when transferring an image with the thermal transfer device, and the transferred image is likely to be incomplete.
Then, the adhesion of the ink image is weakened, and the image is immediately peeled off due to rubbing or the like. In addition, since the static friction coefficient is small, it is difficult to fix the sheet at the time of retransfer, and the sheet moves, so that the retransfer image is distorted and dislocated or misaligned.

Comparative Example 3 A polyethylene terephthalate film having a thickness of 50 μm was coated with a surface treatment agent having the following composition, the contact angle with water was 74 to 78 °, and the coefficient of static friction was about 0.75. A retransfer sheet having a smooth surface was obtained. The elongation of this surface treatment agent is 350%.

Surface treatment agent composition Weight part Ionomer resin 100 [Chemipearl SA-100 manufactured by Mitsui Petrochemical Industry Co., Ltd.] The retransfer sheet thus obtained is transferred by heat-sensitive transfer because it is well wetted. When the image is transferred, the ink and the surface-treating agent strongly adhere to each other, so that the retransfer is incomplete and a clean retransfer image cannot be formed.

Comparative Example 4 A polyethylene terephthalate film having a thickness of 50 μm was coated with a surface treating agent having the following composition, the contact angle with water was about 100 °, and the coefficient of static friction was about 0.25. A retransfer sheet having a smooth surface was obtained. The elongation of this surface treatment agent is 0%.

Surface-treating agent composition : parts by weight Silicone 100 [KR-251, manufactured by Shin-Etsu Chemical Co., Ltd.] The retransfer sheet thus obtained has no wetness at all, although it has appropriate wettability. Therefore, the retransfer is incomplete. Since the ink image is strongly adhered to the surface of the retransfer sheet, the ink remains as a unit in the surface treatment agent without being retransferred.

[0047]

As apparent from the above description, claim 1
According to the invention, when a dry transfer material is produced by using a printing device such as a thermal transfer type printer, a typewriter, and a word processor, a static friction coefficient is 0.25 or more on a retransfer sheet to be printed. Since a certain surface treatment agent is used, it becomes easy to fix the retransfer sheet to the receptor at the time of retransfer, making the retransfer sheet hard to move,
A complete retransfer image can be formed.

According to the invention of claim 3, 100%
Since the surface treatment agent with the above elongation is used, the adhesive force between the ink image and the surface treatment agent decreases due to the expansion of the surface treatment agent due to the pressure during retransfer, and printing on the surface with better wettability than before It is possible to satisfactorily retransfer the transferred image. Therefore, the thermal transfer energy can be reduced and a clear printed image can be obtained. Further, since the adhesion of the ink image is large, the scratch resistance is good and the handling is easy.

By the way, the contact angle to water is 80 to 12
The above effect can be more surely achieved by using a surface treatment agent having a 0 ° and using ethylene-vinyl acetate copolymer and polyethylene as the main components of the surface treatment agent.

[Brief description of the drawings]

FIG. 1 is a sectional explanatory view showing an example of a retransfer sheet according to the present invention.

[Explanation of symbols]

 10 Retransfer Sheet 11 Sheet Base Material 12 Surface Treatment Agent 13 Ink Image

Claims (5)

[Claims] 1. An ink image thermally transferred onto a base material sheet by a thermal transfer method is retransferred to an arbitrary consumer by receiving pressure from the surface of the base material sheet opposite to the ink image transfer side. A retransfer sheet of a dry transfer material for use in the method, wherein the surface treatment agent formed on the surface of the substrate sheet on the ink image transfer side has a coefficient of static friction of 0.25 or more. 2. The retransfer sheet according to claim 1, wherein the contact angle of the surface treatment agent with water is 80 to 120 °. 3. The retransfer sheet according to claim 1 or 2, wherein the surface treatment agent has an elongation of 100% or more. 4. The retransfer sheet according to claim 3, wherein the surface treating agent contains an ethylene-vinyl acetate copolymer. 5. The retransfer sheet according to claim 3, wherein the surface treatment agent contains polyethylene in the composition.